[The first sexual intercourse in girls]

The authors describe the course of the first sexual intercourse in 344 Czech girls examined at the age of 16-18 years. Attention was paid in particular to the following factors: age during first intercourse, period of preceding emotional relationship, age of coital partners, environment where first intercourse took place, motivation of probands, difficulties during first intercourse, contraception used, frequency of sexual intercourse during period following first coitus.